Matter Phase Changes 2425

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A synonym for 'state' of matter is...

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phase

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Two things happen during a phase change:

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1. A substance is converted from 1 form of matter to another.

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2. Energy is either absorbed or released.

Front

Melting happens when a...

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solid becomes a liquid.

Front

Change: H2O (s) ---> H2O (l)

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Melting

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Freezing happens when a...

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liquid becomes a solid.

Front

Change: H2O (l) ---> H2O (s)

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Freezing

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Boiling and evaporation happen when a...

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liquid becomes a gas.

Front

2 Changes: H2O (l) ---> H2O (g)

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Boiling and Evaporation

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The term used to describe when a substance changes from a liquid to a gas:

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Vaporization!

Front

Two differences between boiling & evaporation:

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Boiling: Happens at boiling point (100 C for H2O) and occurs all throughout a liquid.

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Evaporation: Happens at surface of liquid and at a lower temp than boiling.